﻿/**
 * MOTOR 2 - RAPID FLASH DYNAMICS
 * Copyright (c) 2007-2008, Michael Baczynski
 * Based on the Box2D Engine by Erin Catto, http://www.box2d.org
 * 
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 * 
 * * Redistributions of source code must retain the above copyright notice,
 *   this list of conditions and the following disclaimer.
 * * Redistributions in binary form must reproduce the above copyright notice,
 *   this list of conditions and the following disclaimer in the documentation
 *   and/or other materials provided with the distribution.
 * * Neither the name of the polygonal nor the names of its contributors may be
 *   used to endorse or promote products derived from this software without specific
 *   prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package de.polygonal.motor2.math
{
	public class V2
	{
		public var x:Number;
		public var y:Number;
			
		public var next:V2;
		public var prev:V2;
		public var last:Boolean;
		public var I:int;
		
		public var userData:*;
		
		public function V2(x:Number = 0, y:Number = 0)
		{
			this.x = x;
			this.y = y;
			
			next = prev = null;
			last = false;
			I = -1;
		}
		
		public function deconstruct():void
		{
			//TODO kill all
		}
		
		public function getAt(I:int):V2
		{
			var w:V2 = this;
			while (w)
			{
				if (w.I == I) return w;
				if (w.last) break;
				w = w.next;
			}
			return null;
		}
		
		public function toArray():Array
		{
			var w:V2 = this;
			var c:int = 1;
			var a:Array = [w];
			if (last) return a;
			w = w.next;
			while (w)
			{
				a[c++] = w;
				if (w.last) break;
				w = w.next;
			}
			return a;
		}
		
		public function copy():V2
		{
			return new V2(x, y);
		}
		
		public function toString():String
		{
			return "{V2, x=" + x + ", y=" + y + ", I=" + I + ", last = " + int(last) + "}";
		}
	}
}